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| | | | Joined: Aug 2007 Posts: 33 Apprentice | | Apprentice Joined: Aug 2007 Posts: 33 | Hi Guys, The wipers on my '52 GMC don't work at all. I assume they are the vacuum type. Is there an electric motor involved or is it all vacuum? My trucks heater says Airin on it and when I turn the switch on it blows....but barely. The high speed sounds like a low speed on anything else. Is this normal? Thanks in advance, you guys are cool. Terry1218 | | | | | Joined: Aug 2007 Posts: 33 Apprentice | | Apprentice Joined: Aug 2007 Posts: 33 | Terry again, I forgot to mention the truck is a 12 volt system. | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Terry,
Interesting question on the heater blower motor. Your truck was originally 6 volt, positive ground. It is undoubtly (my guess) 12 volt, negative ground now. Some folks run the 6 volt blower motor on 12 volts, then switch motors when it blows up.
They make heavy duty voltage reducers so you can retain the 6 volt motor and run it on the new voltage. Usually the motor runs faster and noisier, even when run through the reducer.
Is your motor a two speed setup, switched by some two pole LO/HI fan switch? I am not sure what the SOP is when switching from positive to negative ground on a heater motor...maybe nothing!
To get net on this thing, I would say either your switch is broken/wired wrong, or the motor is roached. This doesn't help you at all, but this problem would need more research, ideally with a meter to "see" what the voltage is doing.
I don't know if a polarity issue could make this motor run backwards and make it appear to be marginally functional.
I have no clue on your wipers.
Stuart | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | No electricity involved if it's got the vacuum wipers. Most likely, either the hose is bad/kinked/blocked off or the motor might be simply jamed due to the grease inside being hardened up. They can be rebuilt, but I would say for the sake of reliability, change over to electric. Vacuum wipers are fine at idle or relatively low rpm, when the vacuum is highest, but as soon as the throttle opens up, well, the wipers will quit on you! Not good in the rain.
Bill Burmeister
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